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1-can I use the cast iron case and swap the guts of my aluminum tyranny into it




Yes. Most OD 833's had an output shaft with the same size yoke as the 727, some used a 904 size output shaft / Yoke.
If you are reusing the same tail housing your OK either way.


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2-would I use the same rebuild kit for my aluminum tyranny or would I need a different kit




The front bearing will be a different size and so will the bearing retainer. Brewers can put the correct ones in the kit for you. The Gasket kits include all 3 size retainer gaskets so you will be OK. Make sure Wayne knows the year of transmission you are swapping into cast iron case and he will set you up.


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3- do I have to/need to get the cast iron side cover and tail piece also




No both will swap if you use the correct forks for the correct side cover.
I prefer the old style "Ball & Detent" over the later style "Interlock" side cover.